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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f0a2c4d3fabdec9a121f6101ad4ebfa79bdbef006b3e9bfa3b83500179da97' 
  AND token = 'kZk1+DMvRGkxs2Bh2A9xy2d0RmsnhHUZB0u5j6Q4uQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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