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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad48e4d83e6f8df112fbeb9e4924591bcd5ea89d7189b0acabe374ffaed94ac' 
  AND token = 'lyPbx83n61ETy90wgk3U6D6m71uRGkZM4Q5pnV2k6o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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