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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7510b99d98d4d491da4fe2e9c7ec74fb9df5d20795f9447a8baa64be03f8b4ac' 
  AND token = '1nsWwegQOZU8UDiklSTNdAzH//jREE1GVUu0e87vTQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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