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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d1be3fba1422bddc2292ed77412b7963db9943435e90526acfc9eb9e1009f2' 
  AND token = 'Ait1m5xGCuCX23083j9ahFB6+/emmk9yWYL3v+/+c20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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