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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b0d0a9440e6bdcaeef9c1e2d109994a1801904a7c663f910efe8f39b40a32e' 
  AND token = 'sonXmWo5LQ1GPlxKvXNT7o8pk6t1qz29G742LxtPYi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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