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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbde880bbc0350c6ccf168f17c8379a953e2ffed93d74a87b0988581544e4456' 
  AND token = 'UAr9xOo6MZIc74XbRhg1JE9ayTQ3uv6ZANr7gywLzYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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