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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f1d3b55ad8f4cb534c82d1bb03abebb2b3a3236736596fcb3d0ac1db6c6318' 
  AND token = 'rZS5iUP4LpSKji3s/eQNMsT3Irr9roTlHnm52b6ctg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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