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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bac75ad9d34a6d01fba45e532be73413021f0fbde0f376569ab774df31a491' 
  AND token = 'nXqlHIW+Tsmbfk2a0gKIiC6CVdznKhC/8JUCDX1DugA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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