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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20660bd0ca581a5008d7ffe7a872a1bcdaed0584a5635513b444fd2d8c4910c3' 
  AND token = 'PdZ3Cj/rbconl4EDtxaaKLe/RPilQr/VdoNTTWPA+FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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