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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4dfe25cafa3a440e3712b0e0c4860554c8ce281da2f9822cb0c10cb99d95d4' 
  AND token = '4WlTh67sUX8EB5Fh0CkgwejJb6LM9caurHVCwy6afH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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