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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca064c9b80b66dce56fbf811b036a651c665077f5e44230ed0f0c41c90c4bc4d' 
  AND token = '8r7z2q5XijU8L/YF3xmJg8qLssv6HB+CCm0uLnOYjkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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