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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dd968757249cf9d30020c59c7e2ac9b6afa81a2d2d113980ddfc9a3ea86592' 
  AND token = 'MpnyJwvSB2kE6YwZVHoZs+47GFV5JA6v8fndnMTkS+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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