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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd40ce8ddc4d85799b67dd6cb4039c76f656f456074a75d0fd610fd1c96e465' 
  AND token = 'rvwU/0snM3uod+dOzm4DBwOlIg5kX4HaP9/Glb4xb/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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