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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c08a311d7fbc11c5e8a2c91f027ad187700f378b6e75392a7980dfdc80241e' 
  AND token = 'jLwQ32H2TuSElfyqfuulmo/cM02Iv+qif/2sP84mf9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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