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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacb3b45807d1665e282b6c010a8d0108541db3c633012505ade7d58b0bef68e' 
  AND token = '5y+Q1Gky+xbXllF/483GghW3hap9URttPQ+I/2It4Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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