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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae5e4892538f0f00840de856ab44ac526cfd814acc5a5079fc0c725ee6fb887' 
  AND token = 'Phk2Q9w6G51QMYn8EO/n5TUlq85F6M3a8dKNQkMF0+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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