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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d348035ce48c529825d5ef37f9e85dafc5b8a667e760ae5382f41475dddcc2' 
  AND token = 'u8Iql3/ulfaxpuu2pmf5e+Az47HAyFmEPMyR+cqObgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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