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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293a101363b4a674e994afca00f3533116eb4e63c101e4a548733d68f17ccd44' 
  AND token = 'MUK8IELOaDVfF+QQROyK84liuq9S4kOy2ISlUAV0R9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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