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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be72697774f1f80e3eca176ca640a1c476f07bb498f62dfc4d1d3131d374bba' 
  AND token = 'yVSHbIduvdybn2eJL8BiK5l3U+Pur6ttACd3Kaet8hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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