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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20dd7a9eab30f36c4361fc116fc877e0182815258eb9aef65e363bbc11da64c' 
  AND token = 'U5yrJaEqvSGHRaw6MJz7ha538wGv2SuGrpug3bU/3KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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