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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bdbd642e47b4b04dfb978a0811ba1ddc2573f7cd54dc9b44988d8e3fc1d78e' 
  AND token = 'Nek4ePQ4HZ4LUy3tqA4RRF3EF7xF2O8qPf94Of2iojA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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