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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edbb9b35a71de3d0bdb601e5c1aadf8f28b304532747f67e055fbf2f2ab7079' 
  AND token = 'AUv1c6nnVYZPU7MS4w78PM753x6r2+mUpfpW01XRy2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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