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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f71b42b52a1ef28d888f4996f6fd3e3b4d25706aa548df78febfbca9328a29' 
  AND token = 'CgBrjNRDF7gBHDYnTSE7dykKMzc95yfujKhhxr6KMsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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