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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdb625cd3c58414ae7e53e87b531558472884c4f11bfb1efdef981b41e46618' 
  AND token = 'uPfiAy486rLBifalAV2LkVzm/tFYat8nbTZGu7XK3wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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