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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac9a97c33e7c4ea31c6993275ef96a6ef574947368f4c8007e0502e032ee9db' 
  AND token = 'N/HL4jAvVM00Zt/OVlzTb0jd0hTsEwc2Xdg+iWnC/C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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