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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848ba2fee87bb0af36707c475ad964ef0deb10f7da8fa23b2396e22ec19333f6' 
  AND token = 'JP1S7KJyueSwQiHPjAXcjgnixji5Ihxt2Y16nCV1fkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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