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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677eb9c6f5b728ce07cf133fc3e0dd73af68bc7623f22357c746d02fb331adde' 
  AND token = '2+ScP5mCj+BRT55ADe8FgO6+awODftEq4+kTFg8c5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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