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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8745bfd71c014e8d1197796b299113c6a0f46427475d031052766af57283da' 
  AND token = 'bbHJV/vZE5fNawoaYuH1n0Dx64OptTaecibeoVFuqLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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