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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2544cd0683d3f448e847bb32a2170432a2e64739f1ee7590913985f456d431e7' 
  AND token = 'WwuqBXnFa3N0wDaQ4gHChc1j4B4oibRn1IWIs03RbOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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