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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4092db2a6f2f857c748a4d4fe0648ef4a8dbaa05d64cc8182986982ac55589b' 
  AND token = '60B+uESmAD6tLaXOxu3/IOyol3+q91nWk7X/ehFqOBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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