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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38950f89b38057aefe6677ec613591808a98998c018c1703ce150c8eb71612d' 
  AND token = '0fiTb1P1EmEY2BkagYX0NxGT+X7h7kUq7UGMglIE1Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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