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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2d9e834916f44c4421efa74b4aedce7413d2eecb577f87e14e0cea74084e00' 
  AND token = 'wC36vMlCyw0fLa1jF2oyrRRePNmk/TMN///KA1Q1+Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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