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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e65edc30f034752c9d08cc26653920c67c62a34145d0cfccfb2196fb39446c' 
  AND token = 'Avi5R8uYCtQXEE3uU4rW12D0s7/hyupQlSNdVrWFHKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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