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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612a2865301fea10408f43263bf93d17ece5609b556dcaf28b2bd42ad33aaa50' 
  AND token = 'jfJayOPJlvPXX99SChW8+8kHYyOpyW0imXPh/rjbYZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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