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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972c7a0f462a5f6c0d6a92a649937f9c95ea4abe27025acfdb6b69db309c812a' 
  AND token = 'JoT1kx4JwaOKOQgZ1nnMON0C7p3L7vaKRxKVNN9U6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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