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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a123c286caeb6282b4c3fb97d37e1412e13facb1d5f2d09972e34ce1104ff860' 
  AND token = 'foDY2VRt+yt9zcY4pT3DJDs7CEysfWQFfb2c1n6PGWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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