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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99192c829af33208ca37a942ca63de57eeb9637fe5e9ba9802a6ee24b45fecf9' 
  AND token = 'I11sNfdBLQBT9gpdOOA0AjbN0F+D9T76hkvQ8B3RXXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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