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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01312f6a0a992e82c5df10ff5bac6d6c71fe946190701731383b84350c95d0ce' 
  AND token = 'JFJ4ihbrcm+C6icpKO4Z+z992ehNAyrvhznzWscscbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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