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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372e71e4b36db276b686a9a4ce75d6e0dcc7b6fa3f1e4efe29b224cd410a7c00' 
  AND token = 'zM89xHGoW1ma2oVSP53xauEcA7I1e5zoC4RKjzD27rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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