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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31c7b828ba7bd97dade2d0a63edd73b6034ea389310b712c7add7a5b2a11241' 
  AND token = 'HmDqk3NSY/FuG+i5sJHCwnhVG2JZyEhT5oTVBKNUBto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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