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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f47826a065ca63b911214573c9b375c6bf8083c4007dd8ef955494e41995579' 
  AND token = 'dIjCPKtEcbL052XIn/rE2LqqzyYpBJTWleYXyVu5kzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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