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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28877820fc8e5292c2a4c22595a8e67a16a98b9164d168ef648ef38e0fadfaa' 
  AND token = 'EaUfzVfRC6Ap9fyG3pr2c6azgeFgqHopZgXLgZu/gGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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