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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbac8d5a268f78761f7574782e5a2b4872fbe335eae38251ab50ba6336e36ca2' 
  AND token = 'YzpiQ6i1pEokpLcH8/zzP2Z8RWp1uNmyqCJ4ofZwWCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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