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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab634868fe6938bbf853d14e2202ebb49052bf3a3680dbdcbe59b7a3dce8ff6' 
  AND token = 'AFYZnmtQKl1y9LpqY1XsrnShRPyzd113MRRdO+j7blc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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