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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e29c6783734a16b835ab667659a61f216245a1c3be38afa73b7fb155c769fec' 
  AND token = 'dh1GQ/z4gAqEIKmz8A8S2y63FEn5JNxTq4Do4E46BDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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