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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c8b60e145826ba4f1d8d23876b51a8f0fb0e14c0e3aa23c2548bdbc1dac1fe' 
  AND token = 'A1MgY3sOWot5+GexFSq+ErY0wjX/Gi0bIMdywkaj34w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}