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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc220d4ce33db303bfee54f7f96cde9fe505754514861a9d9b3e77410d73062' 
  AND token = 'WTWreEMaiKDi85MeyZCVr2fJ2Ml4ChI+5qutzpSRlvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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