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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9e9a1b068e237cafdb52548cd25af5f188908dcb885a2bba9677c1dd4f9103' 
  AND token = 'NQPLnaskgITZXsL4sEpjO9fMj46JzL+eqX8cLRAionw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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