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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca5bc72c89d61b918abd1dad6b8d1ab86b0a05c08d5b4ef0d7e30c49b8ef360' 
  AND token = 'Sx9edxrRirnzzR496zcsKO8j3/muxs5UB862qxv8Mw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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