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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bfbbcdfa0c6b3405615b88f1c66baf9159fb28e7af217c48d9179ea24f0160' 
  AND token = '6hM29LKZztYScIPBI/zMC2I0fcdSVw5ufLPV9tmqV3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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