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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee8d06b594861900629d64af3c68d9c048b032451ad612bcf2fcf197bb29e96' 
  AND token = 'N9ixaSkish9jqgQz+h0I4MoTPeW7WEoycNrVVAa44g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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