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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8a66609364ea12a1b1168e0289ac75d90a59d7da2927a22fbd71730d85df04' 
  AND token = 'Oac3CSegHhiiISc517XOc+uddyIG9DDNFbjgxPGAgTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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