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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4add505434674ee943d84a99717b025ec3637a3c30a17d345dedf3bf46c2415' 
  AND token = 'dok7+vhSqBdp0S30Db0L1/ts0lpXB1MOnTuCmNP2+ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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